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Question
A primary key should be null.Answer
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Related questions
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All of the following are types of user documentation EXCEPT:
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B) reference guide.
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Testing each module alone in an attempt to discover any errors that may exist in the module's code is referred to as:
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If OrderNumber serves as the primary key in the ORDER relation and also appears as a nonkey attribute in the INVOICE relation, then OrderNumber is said to be a:
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The primary deliverable from logical database design is:
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Key physical database design decisions typically do not include:
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Multiple key retrieval is possible with sequential file organization.
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Sequential files are practical for random row retrievals.
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View integration is the last step of logical database design.
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A recursive foreign key is a foreign key in a relation that references the primary key value of the same relation.
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For a binary one-to-one relationship between two entities, A and B, the primary key of A becomes a foreign key in B and the primary key in B becomes a foreign key in A.
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The creation of a separate relation is sometimes required to represent a relationship.
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A relation is said to be in second normal form if the primary key consists of only one attribute.